Greer Island Park(Beer Can Island) is at the northern tip across the Longboat Pass bridge. A wonderful relatively unused area, Longboat Key has great beaches but public access and parking are somewhat difficult.
Look for the signs indicating the public access points. Here is the list from North to South along Gulf of Mexico Drive:
North Shore Road,
Coral Avenue, Palmetto and Seabreeze, Broadway, Beachwalk, Gulfside Road,
Atlas Street, Hilton, Longview Drive, Mayfield Street, Westfield Street,
Triton Street, Neptune Street
North Lido Beach, a good beach for privacy, is just north after you have gone through St. Armands Circle. Parking is limited, but a great beach. Map
Lido Public Beach is everything you expect in a public beach: a great beach, snack pavilion, play ground, picnic tables and good parking. It is located about 1/2 mile south of the circle. Map
South Lido Park is at the south end of Lido Key. Good parking and a "back to natural
Florida" atmosphere. Large pines and trails into the interior make
this a wonderful spot. Good parking and picnic tables complement this park. Map
A wide award-winning beach with numerous access points in addition to the two main ones. Siesta Village, with its numerous shops, sets the tone.
Siesta Public Beach - you can't miss it — it's big. Even with its large parking lot, its popularity means finding a space on busy days can be a problem. If you like people and a great beach, this is the place. Map
Turtle Beach is near the southern end of the key. Good parking, playground, and walkovers
to the beach. Map